Examine source code of InstaText

{
  "name": "InstaText",
  "version": "1.2.5",
  "description": "Write like a native speaker.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://*/*"
  ],
  "icons": {
    "16": "images/icon-16x16.png",
    "48": "images/icon-48x48.png",
    "128": "images/icon-128x128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "js/content.js"
      ],
      "css": [
        "css/itButton.css",
        "css/highlight.css"
      ],
      "match_about_blank": true,
      "all_frames": true,
      "run_at": "document_idle",
      "match_origin_as_fallback": true
    },
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "js/editor.js"
      ],
      "match_about_blank": true
    },
    {
      "matches": [
        "https://docs.google.com/*"
      ],
      "js": [
        "js/canvasFallback.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "js/alertMessages.json",
    "js/web-accessible/overleaf.js",
    "js/web-accessible/gdocs.js"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "images/icon-48x48.png"
  },
  "externally_connectable": {
    "matches": [
      "*://instatext.io/*"
    ]
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{fc590778-0707-4985-9fa5-3af8e966869e}"
    }
  }
}